Steam-generator.



No. 747,093. PATENTED DEC. '15, 1903. I M. W. SEWALL. STEAM GENERATOR.

APPLICATION FILED JAN. 8. 1903.

N0 MODEL.

THE noams PETERS co. womumo wAsumcn-on. u. c.

crease its power without increasing its size .Patented December 15, 1903.

PATENT OFFICE.

MINOTT W. SEWALL, OF ROSELLE, NEW JERSEY.

STEAM-G EN ERATOR.

'EPECIFICATION formingpart of Letters Patent No. 747,093, dated December 15, 1903.

Application filed January 8, 1903. Serial No. 138.211. (No model.)

To ttZZ whom, it may concern.-

Be it known that I, MINOTT W. SEWALL, a citizen of the United States, and a resident of Roselle, in the county of Union and State of New Jersey, have invented certain new and useful Improvements in Steam-Generators, of which the following is a specification.

This invention relates to water-tube gen- .erators of the Babcock and Wilcox type wherein the group of water-t ubes are inclined from a horizontal plane and which forms an enlarged combustion-space at one end of the furnace wherein the gases of combustion expand before contacting with the group of water-tubes and from said space are directed in various ways across the water-tubes to the uptake. In this type of generator as heretofore constructed the area of the grate-surface has been confined to a width approximately the width of the group of tubes and to a length equal to about one-half the length of said group of tubes, this boundary of gratesurface being heretofore considered a limit that could be conveniently and efficiently utilized in this type of generator. The amount of heating-surface contained in the group of water-tubes has accordinglybeen heretofore provided in relative proportion with said limited grate'surface.

In a generator such as referred to I propose by my present invention to materially inon a horizontal plane in either length or width and, further, to adapt it to the use of bituminous and low-grade anthracite coals.

The invention consists in constructing the generator with a grate-surface practically equal to the horizontal space occupied by the group of water-tubes, with firing-doors at its opposite ends, with a reverberatory roof to the furnace-chamber extending partially the length of the group of water-tubes, and increasing the size of the group of water-tubes by such additional number of tubes forming the group or additional groups as to obtain an increased heating-surface.

In carrying out my present invention reference is made to the accompanying drawing, forming a part of this specification, in which the figure represents a side elevation, partly in section, of a generator embodying the same.

1 indicates the furnace, 2 the group of water-tubes, 3 the headers with which the tubes are connected, and 4 the communicatingsteam and Water drum, these enumerated parts constituting the main essential ele ments in relative arrangement composing the generator. Firing-apertures 5 are made at opposite ends of the furnace, as shown, and a central bridge-wall 6 may also be provided to divide the bed of fuel. The furnace is also provided with a roof 7, extending from one end thereof partially the length of the group of tubes, which reverberates and directs the products of combustion to the end of the furnace-chamber previous'to the contact of the same with the group of water-tubes. Partitions 8 9 may also be arranged as shown to cause the gases to cross and recross the tubes forming the group on their passage to the uptake 10. In the arrangement of these partitions as shown the course of the gases from the furnace to the uptake is indicated by arrows.

By this invention in a generator of the type described I provide a maximum grate-surface and corresponding increase of heatingsurface without adding to its length or width or increased occupation of horizontal space as now constructed and obtain nearly if not quite double its former power.

I am aware that in certain types of generators, such as Scotch boilers or other types of water-tube boilers wherein the arrangement of the tubes do not form an enlarged combustion-chamber at one end of the furnace, it is common to construct a grate-surface extending approximately the full length and width of the structure, and I am also aware that it is common to employ with such an extended grate-surface firing-apertures located at opposite ends or opposite sides thereof, but I am not aware in the particular type of generator herein referred to, in which the furnace-chamber is enlarged at one end and is provided with a reverberatory roof covering the smaller end of the chamber and eX- tending partially over the enlarged end and also provided with two firing-apertures in direct connection with the opposite ends of said chamber, has ever before been known or used which provides for feeding fresh fuel at difierent times and to cause the combustible gases of said fresh fuel to mix directly with the contained and highly-heated and expanded gases in the enlarged part of the furnace-chamber and whereby the carbonic oxid from the fresh fuel is more thoroughly converted and the production of smoke practically prevented.

The elements that make up the structure enumerated in the appended claim do not act independently. They do not constitute an aggregation resulting from a choice of parts, but do create a new combination and act in concert and produce an improved result by their united action.

I claim as my in vention-- A steam-generator in which a group of water-tubes are inclined with relation to the grate-surface and form an enlarged combustion-space at one end of the furnace-chamber,

the combination therewith of a reverberatory roof extending from the smaller end of said chamber and partially covering the enlarged end; an enlarged grate-surface practically equal to the horizontal space occupied by the group of water-tubes; firing-apertures at the respective ends of the grate, and a group of Water-tubes having an increased generatingsurface commensurate with said enlarged grate-surface, as set forth.

Signed at Bayonne, inthe county of Hudson and State of New Jersey, this 18th dayof December, A. D. 1902.

MINOTT W. SEWALL.

' Witnesses:

H. S. CHINNOCK, Jr., WM. J. BUTLER. 

